From fe43fa2f407b9d513f7bcf18142e14e1bf1508d6 Mon Sep 17 00:00:00 2001 From: Ben Gardon Date: Tue, 2 Feb 2021 10:57:08 -0800 Subject: [PATCH] KVM: x86/mmu: Add comment on __tdp_mmu_set_spte __tdp_mmu_set_spte is a very important function in the TDP MMU which already accepts several arguments and will take more in future commits. To offset this complexity, add a comment to the function describing each of the arguemnts. No functional change intended. Reviewed-by: Peter Feiner Acked-by: Paolo Bonzini Signed-off-by: Ben Gardon Message-Id: <20210202185734.1680553-3-bgardon@google.com> Signed-off-by: Paolo Bonzini --- arch/x86/kvm/mmu/tdp_mmu.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c index 3a7ab76aec11..ef3d3e058fa0 100644 --- a/arch/x86/kvm/mmu/tdp_mmu.c +++ b/arch/x86/kvm/mmu/tdp_mmu.c @@ -357,6 +357,22 @@ static void handle_changed_spte(struct kvm *kvm, int as_id, gfn_t gfn, new_spte, level); } +/* + * __tdp_mmu_set_spte - Set a TDP MMU SPTE and handle the associated bookkeeping + * @kvm: kvm instance + * @iter: a tdp_iter instance currently on the SPTE that should be set + * @new_spte: The value the SPTE should be set to + * @record_acc_track: Notify the MM subsystem of changes to the accessed state + * of the page. Should be set unless handling an MMU + * notifier for access tracking. Leaving record_acc_track + * unset in that case prevents page accesses from being + * double counted. + * @record_dirty_log: Record the page as dirty in the dirty bitmap if + * appropriate for the change being made. Should be set + * unless performing certain dirty logging operations. + * Leaving record_dirty_log unset in that case prevents page + * writes from being double counted. + */ static inline void __tdp_mmu_set_spte(struct kvm *kvm, struct tdp_iter *iter, u64 new_spte, bool record_acc_track, bool record_dirty_log) -- 2.11.0